CN112939524A - Preparation method of carbide slag and geopolymer building block excited by mirabilite - Google Patents

Preparation method of carbide slag and geopolymer building block excited by mirabilite Download PDF

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Publication number
CN112939524A
CN112939524A CN202110411935.9A CN202110411935A CN112939524A CN 112939524 A CN112939524 A CN 112939524A CN 202110411935 A CN202110411935 A CN 202110411935A CN 112939524 A CN112939524 A CN 112939524A
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geopolymer
mirabilite
carbide slag
building block
fly ash
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王金玉
但建明
李洪玲
闫仕杰
刘哲
刘洋
翟源
孙亚鑫
胡滨
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Shihezi University
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Shihezi University
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/0006—Waste inorganic materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/147—Alkali-metal sulfates; Ammonium sulfate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a preparation method of carbide slag and geopolymer building blocks excited by mirabilite, according to the principle of the preparation process of fly ash geopolymer, the raw materials of the method mainly comprise industrial solid waste carbide slag, mirabilite, fly ash, desulfurized fly ash and water, and the building blocks are prepared by the working procedures of ball milling, screening, mixing, stirring, molding and curing. According to the invention, the traditional liquid caustic soda and water glass solution are replaced by the solid wastes such as carbide slag and mirabilite and the like as the exciting agent to excite the silicon-aluminum substances in the fly ash, so that on one hand, the use of cement can be reduced, and the use of CO can be reduced2The discharge of the geopolymer building block is good, the obtained geopolymer building block has good performance, the requirements of the building block are met, the cost for producing the geopolymer building block is obviously reduced, the use and transportation cost of the exciting agent is reduced, and meanwhile, the cyclic utilization of the solid waste carbide slag and the mirabilite is realized. Preparation of the resulting GeopolymerThe building block has good use performance.

Description

Preparation method of carbide slag and geopolymer building block excited by mirabilite
Technical Field
The invention belongs to the field of building material preparation and solid industrial solid waste recycling, and particularly relates to a preparation method of a geopolymer building block excited by carbide slag and mirabilite.
Background
With the rapid development of China, the urbanization process is accelerated, and a large amount of building materials, namely geopolymers (geopolymers for short), are urgently needed, and the geopolymers are a binder prepared by reacting aluminosilicate in an alkaline environment. The material has excellent mechanical performance, acid and alkali resistance, fire resistance and high temperature resistance. The geopolymer has the advantages of wide raw material sources, low energy consumption, low pollution and simple process, and is a green material for sustainable development. The traditional geopolymer mostly uses fly ash as an aluminum source and a silicon source, and water glass and liquid alkali activation are adopted as alkaline activators to react with the fly ash to generate strength. The production using water glass and liquid caustic soda is relatively expensive, and the transportation process of the liquid caustic soda also has the disadvantages of high risk and high cost.
The carbide slag is industrial solid waste with the main component of calcium hydroxide, about 1.2 tons of carbide slag are discharged when 1 ton of carbide is produced, and about 3100 million tons of carbide slag are discharged every year nationwide. The carbide slag has certain recycling value due to high calcium hydroxide content and alkalinity, but the existing carbide slag recycling technology is still immature and is difficult to digest and utilize on a large scale. Mirabilite is a byproduct generated in the chlor-alkali industry and salt lake production, the market is in a situation of supply and demand, and a large amount of mirabilite can only be stockpiled in some areas. The storage of the two solid wastes not only occupies the land, but also causes environmental pollution, so that the utilization approach of the waste residues is urgently sought.
Disclosure of Invention
The invention aims to provide a preparation method of a geopolymer building block excited by carbide slag and mirabilite, which is prepared by the following steps of ball milling, screening, mixing, stirring, forming and curing according to the principle of a preparation process of a pulverized coal ash geopolymer, wherein raw materials of the method mainly comprise industrial solid waste carbide slag, mirabilite, fly ash, desulfurized ash and water. According to the invention, the traditional liquid caustic soda and water glass solution are replaced by the solid wastes such as carbide slag and mirabilite and the like as the exciting agent to excite the silicon-aluminum substances in the fly ash, so that on one hand, the use of cement can be reduced, and the use of CO can be reduced2The discharge of the geopolymer building block is good, the obtained geopolymer building block has good performance, the requirements of the building block are met, the cost for producing the geopolymer building block is obviously reduced, the use and transportation cost of the exciting agent is reduced, and meanwhile, the cyclic utilization of the solid waste carbide slag and the mirabilite is realized. The geopolymer building block prepared by the method has good service performance.
The invention relates to a preparation method of a geopolymer building block excited by carbide slag and mirabilite, which comprises the following steps:
a. pretreatment of raw materials: respectively grinding 60-90% of fly ash and 5-10% of desulfurized gypsum as raw materials, screening to obtain the fly ash with the particle size of 150-350 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding the carbide slag with the mass fraction of 5-15% and one or more of mirabilite with the mass fraction of 0-10% as an exciting agent, screening, removing impurities, drying, adding one or more of sodium hydroxide, sodium carbonate, lime and water glass with the mass fraction of 0-5% as an additive, and uniformly mixing;
c. and (b) adding water accounting for 20-40% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then putting the geopolymer cementing material into a mould, vibrating for two minutes to obtain a geopolymer semi-finished product, then putting the obtained semi-finished product into a curing box, curing for 3-28 days at the temperature of 25-90 ℃ and the humidity of 50-100%, and demoulding to obtain the geopolymer building block.
The mass fraction of the fly ash in the step a is 70-90%.
In the step c, the temperature is 40-70 ℃, and the humidity is 80-100%.
Compared with the traditional geopolymer block preparation technology, the method for preparing the geopolymer block excited by the carbide slag and the mirabilite has the advantages that industrial waste replaces high-price sodium hydroxide and water glass as exciting agents, and the raw material cost is effectively reduced. And the solid excitant is used for replacing the liquid excitant, so that the transportation efficiency of the raw materials can be effectively improved, and the transportation cost is reduced. In addition, the method can realize large-scale harmless treatment on industrial wastes such as carbide slag, mirabilite and the like, so the technology has good popularization and utilization prospects.
Drawings
FIG. 1 is a diagram of the preparation process of the present invention.
Detailed Description
Example 1
a. Pretreatment of raw materials: respectively grinding 60 mass percent of fly ash and 10 mass percent of desulfurized gypsum as raw materials, screening to obtain 150-mesh fly ash, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding 15 mass percent of carbide slag and 10 mass percent of mirabilite serving as exciting agents, screening to obtain 200-mesh-thick carbide slag and 200-mesh-thick mirabilite, removing impurities, drying, adding 5 mass percent of sodium hydroxide serving as an additive, and uniformly mixing;
c. and (b) adding water accounting for 40% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, curing at the temperature of 25 ℃, keeping the humidity of 100%, curing for 28 days, and demolding to obtain the geopolymer building block with the flexural strength of 11.8Mpa and the compressive strength of 38.1 Mpa.
Example 2
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material weight of 85% and the desulfurized gypsum with the raw material weight of 5%, screening to obtain the fly ash with the grain size of 250 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding carbide slag with the mass fraction of 5% and mirabilite with the mass fraction of 3% as an exciting agent, screening to obtain carbide slag with the particle size of 200 meshes and mirabilite with the particle size of 200 meshes, removing impurities, drying, adding sodium carbonate with the mass fraction of 2% as an additive, and uniformly mixing;
c. and (b) adding water accounting for 20% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 40 ℃, the humidity at 50% and the curing time at 5 days, and demolding to obtain the geopolymer building block with the flexural strength of 13.8Mpa and the compressive strength of 39.2 Mpa.
Example 3
a. Pretreatment of raw materials: respectively grinding 70 mass percent of fly ash and 8 mass percent of desulfurized gypsum as raw materials, screening to obtain 300-mesh fly ash, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding carbide slag with the mass fraction of 10% and mirabilite with the mass fraction of 8% as an exciting agent, screening to obtain carbide slag with the particle size of 200 meshes and mirabilite with the particle size of 200 meshes, removing impurities, drying, adding an additive with the mass fraction of 4% and uniformly mixing with lime;
c. and (b) mixing and stirring the raw materials treated in the step a and the exciting agent treated in the step b with water accounting for 22% of the weight of the dry materials to obtain a geopolymer cementing material, then putting the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then putting the obtained semi-finished product into a curing box, keeping the temperature at 70 ℃, the humidity at 80% and the curing time at 3 days, and demolding to obtain the geopolymer building block with the flexural strength of 14.3Mpa and the compressive strength of 41.3 Mpa.
Example 4
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material weight percentage of 75% and the desulfurized gypsum with the raw material weight percentage of 10%, screening to obtain the fly ash with the grain size of 350 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding the carbide slag with the activator accounting for 10 percent of the mass fraction and the mirabilite accounting for 3 percent of the mass fraction, screening to obtain the carbide slag with the particle size of 200 meshes, screening the mirabilite to obtain the mirabilite with the particle size of 200 meshes, removing impurities, drying, adding the water glass with the additive accounting for 2 percent of the mass fraction, and uniformly mixing;
c. and (b) adding water accounting for 30% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 30 ℃, the humidity at 60%, curing for 10 days, and demolding to obtain the geopolymer building block with the flexural strength of 15.2Mpa and the compressive strength of 43.2 Mpa.
Example 5
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material mass percentage of 80% and the desulfurized gypsum with the raw material mass percentage of 6%, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding carbide slag with the mass fraction of 5% and mirabilite with the mass fraction of 4% as an exciting agent, screening to obtain carbide slag with the particle size of 200 meshes and mirabilite with the particle size of 200 meshes, removing impurities, drying, adding water glass with the mass fraction of 5% as an additive, and uniformly mixing;
c. and (b) adding water accounting for 32 percent of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then putting the geopolymer cementing material into a mould, vibrating for two minutes to obtain a geopolymer semi-finished product, then putting the obtained semi-finished product into a curing box, curing at the temperature of 60 ℃, the humidity of 70 percent, curing for 20 days, and demolding to obtain the geopolymer building block with the flexural strength of 6.8Mpa and the compressive strength of 15.2 Mpa.
Example 6
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material weight of 85% and the desulfurized gypsum with the raw material weight of 5%, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding carbide slag with the mass fraction of 6% and mirabilite with the mass fraction of 3% as an exciting agent, screening to obtain carbide slag with the particle size of 200 meshes and mirabilite with the particle size of 200 meshes, removing impurities, drying, adding sodium hydroxide with the mass fraction of 1% as an additive, and uniformly mixing;
c. and (b) adding water accounting for 29 percent of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, curing at the temperature of 80 ℃, at the humidity of 90 percent, for 23 days, and demolding to obtain the geopolymer building block with the flexural strength of 6.3Mpa and the compressive strength of 14.6 Mpa.
Example 7
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material of 82% by mass and the desulfurized gypsum with the raw material of 7% by mass, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding carbide slag with the mass fraction of 6% and mirabilite with the mass fraction of 3% as an exciting agent, screening to obtain carbide slag with the particle size of 200 meshes and mirabilite with the particle size of 200 meshes, removing impurities, drying, adding sodium carbonate with the mass fraction of 2% as an additive, and uniformly mixing;
c. and (b) adding water accounting for 24% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 90 ℃, the humidity at 70%, curing for 16 days, and demolding to obtain the geopolymer building block with the flexural strength of 9.2Mpa and the compressive strength of 29.7 Mpa.
Example 8
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material mass fraction of 69% and the desulfurized gypsum with the raw material mass fraction of 7%, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding the carbide slag with the mass fraction of 10% and the mirabilite with the mass fraction of 8% as the exciting agent, screening to obtain the carbide slag with the particle size of 200 meshes and the mirabilite with the particle size of 200 meshes, removing impurities, drying, adding lime with the mass fraction of 4% as the additive, and uniformly mixing;
c. and (b) adding water accounting for 40% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 70 ℃, the humidity at 100%, curing for 22 days, and demolding to obtain the geopolymer building block with the flexural strength of 9.0Mpa and the compressive strength of 28.4 Mpa.
Example 9
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material mass percentage of 71% and the desulfurized gypsum with the raw material mass percentage of 10%, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding 12 mass percent of carbide slag and 5 mass percent of mirabilite serving as exciting agents, screening to obtain 200-mesh-thick carbide slag and 200-mesh-thick mirabilite, removing impurities, drying, adding 2 mass percent of water glass serving as an additive, and uniformly mixing;
c. and (b) adding water accounting for 29 percent of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 55 ℃ and the humidity at 65 percent, curing for 8 days, and demolding to obtain the geopolymer building block with the flexural strength of 9.3Mpa and the compressive strength of 29.9 Mpa.
Example 10
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material of 82% by mass and the desulfurized gypsum with the raw material of 6% by mass, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding carbide slag with the mass fraction of 6% and mirabilite with the mass fraction of 6% as an exciting agent, screening to obtain carbide slag with the particle size of 200 meshes and mirabilite with the particle size of 200 meshes, removing impurities, drying and uniformly mixing;
c. and (b) adding water accounting for 37% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 75 ℃, the humidity at 85%, curing for 25 days, and demolding to obtain the geopolymer building block with the flexural strength of 5.6Mpa and the compressive strength of 20.3 Mpa.
Example 11
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material mass fraction of 90% and the desulfurized gypsum with the raw material mass fraction of 5%, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: grinding the carbide slag with the excitant accounting for 5% of the mass fraction, screening to obtain the carbide slag with the particle size of 200 meshes, removing impurities, drying and mixing uniformly;
c. and (b) adding water accounting for 20% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 90 ℃, the humidity at 50% and the curing time at 28 days, and demolding to obtain the geopolymer building block with the flexural strength of 9.6Mpa and the compressive strength of 30.2 Mpa.
Example 12
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material mass fraction of 84% and the desulfurized gypsum with the raw material mass fraction of 9%, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: grinding the carbide slag with the exciting agent accounting for 7% of the mass fraction, screening to obtain the carbide slag with the particle size of 200 meshes, removing impurities, drying and uniformly mixing;
c. and (b) adding water accounting for 40% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 40 ℃, the humidity at 100%, curing for 18 days, and demolding to obtain the geopolymer building block with the flexural strength of 9.9Mpa and the compressive strength of 31.2 Mpa.
Example 13
a. Pretreatment of raw materials: respectively grinding the fly ash with the raw material weight percentage of 75% and the desulfurized gypsum with the raw material weight percentage of 10%, screening to obtain the fly ash with the particle size of 200 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding 11 mass percent of carbide slag and 4 mass percent of mirabilite serving as exciting agents, screening to obtain 200-mesh-sized carbide slag and 200-mesh-sized mirabilite, removing impurities, drying and uniformly mixing;
c. and (b) adding water accounting for 32 percent of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 55 ℃ and the humidity at 80 percent for 28 days, and demolding to obtain the geopolymer building block with the flexural strength of 13.2Mpa and the compressive strength of 40.2 Mpa.
Example 14
a. Pretreatment of raw materials: respectively grinding 70 mass percent of fly ash and 10 mass percent of desulfurized gypsum as raw materials, screening to obtain 200-mesh fly ash, removing impurities, and drying for later use;
b. pre-treating an exciting agent: grinding the carbide slag with the activator accounting for 15 percent of the mass fraction, screening to obtain the carbide slag with the particle size of 200 meshes, removing impurities, drying, adding sodium hydroxide with the additive accounting for 5 percent of the mass fraction, and uniformly mixing;
c. and (b) adding water accounting for 37% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then placing the geopolymer cementing material into a mold, vibrating for two minutes to obtain a geopolymer semi-finished product, then placing the obtained semi-finished product into a curing box, keeping the temperature at 70 ℃, the humidity at 80%, curing for 23 days, and demolding to obtain the geopolymer building block with the flexural strength of 14.1Mpa and the compressive strength of 41.3 Mpa.
According to the preparation method of the geopolymer building block excited by the carbide slag and the mirabilite, the silicon-aluminum substances in the fly ash are excited by the alkaline exciting agent generated after the reaction of the carbide slag and the mirabilite, so that the use of cement can be reduced, and the use of CO is reduced2On the other hand, the obtained geopolymer building block has good performance and meets the requirements of the building block.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (3)

1. A preparation method of a geopolymer building block excited by carbide slag and mirabilite is characterized by comprising the following steps:
a. pretreatment of raw materials: respectively grinding 60-90% of fly ash and 5-10% of desulfurized gypsum as raw materials, screening to obtain the fly ash with the particle size of 150-350 meshes, removing impurities, and drying for later use;
b. pre-treating an exciting agent: respectively grinding carbide slag with the mass fraction of 5-15% and mirabilite with the mass fraction of 0-10% as an exciting agent, screening, removing impurities, drying, adding sodium hydroxide, sodium carbonate, lime or water glass with the mass fraction of 0-5% as an additive, and uniformly mixing;
c. and (b) adding water accounting for 20-40% of the weight of the dry materials into the raw materials treated in the step a and the exciting agent treated in the step b, mixing and stirring to obtain a geopolymer cementing material, then putting the geopolymer cementing material into a mould, vibrating for two minutes to obtain a geopolymer semi-finished product, then putting the obtained semi-finished product into a curing box, curing for 3-28 days at the temperature of 25-90 ℃ and the humidity of 50-100%, and demoulding to obtain the geopolymer building block.
2. The method for preparing the carbide slag and mirabilite-excited geopolymer building block according to claim 1, wherein the mass fraction of the fly ash in the step a is 70-90%.
3. The method for preparing the carbide slag and mirabilite-excited geopolymer building block according to claim 1, wherein the temperature in step c is 40-70 ℃ and the humidity is 80% -100%.
CN202110411935.9A 2021-04-16 2021-04-16 Preparation method of carbide slag and geopolymer building block excited by mirabilite Pending CN112939524A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104649599A (en) * 2014-12-24 2015-05-27 金川集团股份有限公司 Early-strength filling gel material prepared by using solid wastes
CN106277970A (en) * 2016-08-10 2017-01-04 卓达新材料科技集团威海股份有限公司 A kind of hot-forming slag building waste sheet material
WO2020097690A1 (en) * 2018-11-16 2020-05-22 Canasia Australia Pty Ltd Geopolymer compositions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104649599A (en) * 2014-12-24 2015-05-27 金川集团股份有限公司 Early-strength filling gel material prepared by using solid wastes
CN106277970A (en) * 2016-08-10 2017-01-04 卓达新材料科技集团威海股份有限公司 A kind of hot-forming slag building waste sheet material
WO2020097690A1 (en) * 2018-11-16 2020-05-22 Canasia Australia Pty Ltd Geopolymer compositions

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